That the radio lobes radiate synchrotron radiation indicates that
a. high-speed electrons are spiraling through a magnetic field.
b. the source of the radio jets must be a black hole.
c. the source of the radio energy is rotating rapidly.
d. the central galaxy must be a giant elliptical galaxy.
e. the central galaxy must rotate about two nearly perpendicular axes.
a
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All but one of the following statements describe why scientists doubt the solar sunspot cycle affects global climate. Identify which statement is irrelevant to the explanation
A) Solar winds can affect satellite communications. B) The variations in solar particle winds do not change the temperature of the Earth's ocean or ground. C) The solar cycle varies every 11 years; average Earth temperatures do not show an 11 year variation. D) Variations in solar activity affect the Sun's luminosity by a very tiny amount.
Force on a Moving Charge: At a particular instant, an electron moves toward the east in a uniform magnetic field that is directed straight downward. The magnetic force that acts on it is
A. zero. B. upward. C. toward the north. D. toward the south. E. downward.
A mouse is running away from a cat at 0.75 m/s and, at 1.25 m from his mouse hole, he accelerates at a constant rate of 0.25 
until he reaches his hole safely. How long a time was required for him to cover the last 1.25 m?
A. 1.4 s B. 1.7 s C. 1.2 s D. 10 s
Gamma radiation is characterized by greater ability to penetrate materials than alpha or beta
What will be an ideal response?